Sylvie Willis
If your John Deere 820 diesel tractor is not running properly, it could be due to air trapped in the fuel lines. To bleed a John Deere 820 diesel fuel system, you must first locate the fuel filter and fill it completely. Then, loosen the bleed screw on top of the fuel filter housing. Manually actuate the fuel transfer pump by turning the key for an electric motor or cranking the engine for a gear-type pump. Next, prime the fuel pump until you see a steady flow of fuel from the open bleeder screw, after which you can tighten the screw. If the engine still fails to start, you may need to loosen the high-pressure line connections at the injectors and crank the engine until fuel emerges from the fuel lines.
How to bleed a John Deere 820 diesel fuel system
| Characteristics | Values |
|---|---|
| Problem | Fuel system won't run after running out of fuel |
| Solution | Bleed air from the fuel system |
| Steps | 1. Fill up fuel filters completely full 2. Loosen bleed screw on top of fuel filter housing 3. Manually actuate fuel transfer pump (turn key for electric motor or crank engine for gear type pump) primer lever until fuel flows from open bleeder screw top of filter housing, then tighten screw 4. Loosen bleeder screw on injection pump 5. Actuate fuel pump primer lever and re-tighten bleed screw when you see a steady fuel flow 6. If the engine fails to start, loosen high-pressure line connections at injectors. Crank the engine until fuel emerges from fuel lines. Re-tighten lines, then crank the engine |
| Additional Tips | If the engine runs but idles roughly, crack the bleeder until it idles smoothly. Check the fuel cap for a blockage of the fuel vent or the strainer upstream of the valve for clogging. If fuel is controlled by an electric solenoid, it could be the problem. |
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What You'll Learn
Check for contaminated fuel
It is important to check for contaminated fuel in your John Deere 820 diesel fuel system to prevent engine damage. Fuel contamination can result in loss of equipment, ruined engines, damaged fuel tanks, and other dangers. Most fuel has some level of contamination from the moment it leaves the refinery, and this can be caused by something in the air or environment.
There are a few ways to check for contaminated fuel. One common method is to drain a small amount of fuel from the tank and put it in a glass container. If the fuel is contaminated with water, you will see the water sink to the bottom of the glass. If there is ethanol in the fuel as well, the water will not settle at the bottom but will be mixed with the fuel. This type of contamination will dissipate over time and does not need to be drained.
Another way to test for contaminated fuel is to send a sample to a lab for testing. The lab will provide a special shipping container and a package to return the sample. Once they receive the sample, they will test it and email the results within 24 hours.
Additionally, you can look for signs of fuel tank contamination, such as frequently clogged filters or filters needing replacement. Contamination can also be caused by microorganisms, rust, dust, pollen, or other airborne contaminants that enter the fuel tank when it is open or improperly sealed.
To prevent further or severe contamination, it is recommended to ensure that caps and lids are replaced and secured tightly after each use. It is also advised to use only new or well-maintained fuel tanks for storing fuel.
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Ensure there is no air in the system
To ensure there is no air in the fuel system of a John Deere 820 diesel engine, follow these steps:
First, locate the fuel filter and the fuel lines. The fuel filter on a John Deere 820 is usually found near the fuel injection pump, and the fuel lines will be connected to it. Make sure you have identified all the components correctly before proceeding.
Next, you will need to bleed the fuel filter and lines. Start by closing the fuel shut-off valve, which should be located on the fuel line near the filter. Then, loosen the fuel line at the filter, and allow any air or fuel to drain into a suitable container. Re-tighten the fuel line once the fuel flow slows to a drip. This will ensure that any air is bled out and that the fuel system is primed. Check your fuel filter for any signs of damage or debris build-up, replacing it if necessary.
Now, you need to ensure that no air is trapped in the fuel injection system. Loosen the bleeder screw on the fuel injection pump, and have a container ready to catch any fuel or air that escapes. Keep loosening the screw until you hear a steady stream of fuel, with no air bubbles, then tighten the screw. This process may need to be repeated several times to ensure all air is removed.
Finally, check for any signs of air leaks in the system. With the engine off, inspect all fuel lines, connections, and components for any signs of leaks or damage. Look for any cracks, wear, or loose connections that could allow air into the system. Rectify any issues found and ensure all components are securely connected and sealed. A visual inspection is a simple but vital step to ensure the ongoing smooth operation of your engine.
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Loosen the bleeder screw on the injection pump
To loosen the bleeder screw on the injection pump of a John Deere 820 diesel fuel system, you must first ensure that the fuel filters are completely full. This can be done by filling up the fuel filters or removing the fuel filter and placing it in its own "filter canister" to fill it with fresh diesel.
Once the filters are full, locate the bleeder screw on the injection pump. This is usually found on top of the fuel filter housing, and in some cases, it may be a 10mm bleed screw at the filter head. Loosen this bleeder screw by turning it counterclockwise with a suitable tool, such as a screwdriver or a wrench.
After loosening the screw, you may need to manually actuate the fuel transfer pump. This can be done by turning the key for an electric motor or cranking the engine for a gear-type pump. You may also need to prime the lever until you see a steady flow of fuel from the open bleeder screw.
At this point, you can re-tighten the bleeder screw. Make sure to do this securely, as you don't want any fuel leaks.
If the engine still fails to start, you may need to repeat the process or try additional steps, such as loosening the high-pressure line connections at the injectors and cranking the engine until fuel emerges from the fuel lines.
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Remove the fuel filter
To remove the fuel filter from a John Deere 820 diesel fuel system, there are several steps you should follow. Firstly, park your tractor or equipment on a level surface to prevent fuel from spilling and ensure you are wearing safety glasses and gloves to protect yourself from diesel fuel exposure. Allow the engine to cool down before proceeding, as hot engine components can cause burns.
Locate the fuel filter, which is typically mounted on the engine or near the fuel tank. Refer to your operator's manual for the specific location, as it may vary depending on the model. Once you have located the fuel filter, gather the necessary tools and materials, including a hand primer pump, a new fuel filter, and a collection pan or container to catch any spilled fuel.
Now, you can begin the process of removing the fuel filter. Place a collection pan or container underneath the fuel filter to catch any spilled fuel. Then, carefully disconnect the fuel lines and electrical connections leading to the fuel filter. Loosen any clamps or bolts securing the fuel filter in place and gently lift it out of its housing. Check for any signs of damage, debris, or clogging on the fuel filter and housing.
If you are replacing the fuel filter, ensure you use a genuine John Deere filter. Aftermarket filters may not provide the same level of protection and performance. Refer to your operator's manual for the recommended replacement interval, which is typically every 500-1000 operating hours.
By following these steps, you can safely and effectively remove the fuel filter from your John Deere 820 diesel fuel system, ensuring optimal fuel flow and engine health. Remember to dispose of the old fuel filter properly and according to local regulations.
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Check the fuel cap for blockages
To check the fuel cap for blockages, start by removing the cap from the fuel filler neck. Inspect the fuel cap for any signs of damage or wear and tear. Look for cracks, chips, or other damage that could compromise the seal.
Next, examine the O-ring, which is the rubber gasket inside the fuel cap. Ensure that it is clean and free of any dirt or debris. A dirty or contaminated O-ring can affect the sealing capability of the fuel cap, allowing fuel vapors to escape. Use a soft cloth to gently clean the O-ring if necessary.
After inspecting and cleaning the fuel cap, securely reinstall it onto the fuel filler neck. Turn the cap until you hear it click into place. Depending on your vehicle, you may need to turn it until you hear two or three clicks.
Once the fuel cap is securely in place, start the engine and observe whether the "check fuel cap" warning light turns off. If the warning light persists, there may be another issue causing the problem, and you may need to consult a mechanic or a car dealer for further diagnosis and assistance.
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Frequently asked questions
Start by filling up the fuel filters completely. Then, loosen the bleed screw on top of the fuel filter housing. Manually actuate the fuel transfer pump and prime the pump until fuel flows from the open bleeder screw, then tighten the screw.
Loosen the high-pressure line connections at the injectors, then crank the engine until fuel emerges from the fuel lines. Re-tighten the lines and crank the engine again.
Check for contaminated fuel in the tank. There may be algae causing supply problems. Follow the fuel lines back to the tank and ensure there is no restriction in the flow.
Check if the fuel return line or return line fitting that attaches to the IP is plugged. Also, ensure there is no air trapped in the fuel lines.
The manual will guide you on how to check for air in the system after changing the fuel filter.
